A Calculation Approach for Frame Anti-Sliding Piles
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摘要: 基于空间协同作用的框架式抗滑桩力学分析模型考虑了桩、梁、岩土之间的相互作用及桩间土拱效应, 运用空间协同分析机理对框架式抗滑桩结构的内力和变形规律进行分析, 较好的弥补了当前主要采用桩土效应对多排抗滑桩进行受力分析的局限性.根据框架式抗滑桩受力模型的基本假定, 采用分段计算方法, 以框架式抗滑桩的滑动面为分界将桩体结构分为两段, 综合运用土拱效应、平衡协调原理及弹性地基梁方法, 分别建立框架式抗滑桩上下部分的受力计算方程, 给出该模型受力计算的数学解析方程组求解法, 并采用MATLAB对方程组进行编程计算, 结合工程实例的实验结果进行对比分析该数学解析法的正确性.Abstract: Contemporary force models of double row piles are mainly established on the basis of soil arch effect, ignoring interactions between top ring beam and link beam. In this paper, a force model of frame anti-sliding piles is presented to solve the problem efficiently for its spatial force analyzing techniques, which takes double row anti-slide piles as a single-layer multi-span frame structure composed of piles, beams and soils. A calculation approach for the model is proposed. It decomposes the frame structure into two parts along sliding surface, and deformation equations are rebuilt up correspondingly under pile lead border condition, continuous deformation of strong point, static force balance and deformation coordination between top ring beams and pile leads. A program is developed using MATLAB. Finally, the approach is applied in the test of Three Gorges reservoir geo-hazard prevention project, and the result shows that it is suitable for force calculation of frame anti-sliding piles.
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图 3 q(a)和qb(b)产生固端弯矩示意
Fig. 3. Bending moment produced by q (a) and qb (b) in fixed ends
图 4 (qf+qa)(a)和qb(b)产生固端弯矩示意
Fig. 4. Bending moment produced by qf+qa (a) and qb (b) in fixed ends
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